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This adds "icc_profile" key support in [output] sections for backends headless, x11, wayland, and drm, and also for remoted and pipewire outputs FWIW. On the other hand, RDP-backend does not use output sections from weston.ini, and fbdev-backend does not deserve anything new (it wouldn't support color management anyway due to no GL-renderer). This allows one to configure an ICC v2 or v4 file to be used as an output profile. However, color-lcms does not actually use output profiles yet, so trying this will fail until support is implemented. The parent_winsys_profile argument is reserved for using the color profile from a parent window system where applicable, if nothing else is set in weston.ini. None of the nested backends provide an output color profile yet. It is more of a reminder of a missing feature than a serious implementation. Note: cms-static Weston plugin uses the exact same weston.ini key for loading VCGT from ICC profiles. If "color-management" option is set to false, this new use of "icc_profile" is disabled and the old behavior with cms-static is kept. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
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